MidAmerican Energy is adding hundreds of smart sensors to electric lines in an effort to identify the source of power outages faster and send crews directly to the source, MidAmerican Energy announced on Wednesday. The devices, called remote fault indicators, attach to power lines and transmit outage and location details to MidAmerican Energy control room operators if they detect a service interruption. More than 200 sensors have been installed so far in Sioux City, Council Bluffs, Fort Dodge, Des Moines, Waterloo, iowa City and the Quad Cities; representatives expect the company will complete installation at 150 additional locations in the next month.